Delete row sig_75bd9c5694c7 from signals

id sig_75bd9c5694c7
event_id evt_8bbc52f85dd9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5286082 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:05:09Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:05:09.377597+00:00
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